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Nov. 20, 1962
E. F. REXER. JR
3,065,291
ELECTRON DISCHARGE DEVICE
Filed Aug. 2'7, 1956
LIu-r.if
INVENTOR.
EDWARD F. REXER JR.
BY/4¢M%¢7< '
rice
1
3,065,291
ELECTRDN DiStlHARGE DEVlQE
Edward F. Rexer, In, Hopkins, Minn, assignor to Minne
apolis-Honeywell Regulator Company, Minneapoiis,
lViinrL, a corporation of Delaware
Filed Aug. 27, 1956, Ser. No. 606,325
2 Claims. (Ci. 174-5964)
The present invention relates to ceramic electron tubes,
and especially to improved methods of bringing the ter
minal connections of such a device through the tube
envelope.
An object of this development is to provide an electron
discharge device having a ceramic envelope comprising
Patented Nov. 20, 1962
2
other suitable metalizing mixture may also be utilized to
provide the conductors. It will be appreciated that the
metalized conductor is very thin, preferably of a thickness
in the order of one mil. It will be obvious that this sinter
ing, in order to insure a hermetic or vacuum seal, must
involve bringing the metalized strips up to the melting
temperature of at least the lowest melting point material
of the strips. It will furthermore be obvious that in order
to avoid interruption of the electrical continuity of the
very thin strips, the sintering must occur at a temperature
below the melting point of the ceramic since otherwise the
material of the strips would tend to disperse into the
soft ceramic. The obvious advantage of this invention
is that the number of seals in the tube envelope is reduced
two sections sealed together, and in which a number of the 15 to a minimum.
necessary lead-in terminals are brought through the single
In order to prevent electrical leakage between the plu~
seal, thereby reducing to a minimum the number of
rality of conductors, a nonconductive sealing material 32
vacuum tight seals required in the envelope.
is used to bond together the upper ceramic section to the
A more speci?c object of this invention is to provide
ceramic base of the tube. Any suitable nonconductive
an electron discharge device having a ceramic envelope 20 sealing material which will bond ceramic to ceramic and
comprising a ceramic base portion and a cylindrical
ceramic to metal can be used, however, a glass frit is pre
ceramic upper portion, in which radial metallic conductors
ferred. The sealing material 32 may be applied to the final
are metalized onto said ceramic base to provide a plu
seal areas of the two envelope sections, and the seal is
rality of lead-in conductors through the single sealing area
perfected by a temperature cycle su?‘iciently high to melt
between said base and upper ceramic member.
25 the glass frit. The temperature cycle used to accomplish
This and other objects of my invention will be under
the ?nal seal is substantially lower than the melting point
stood upon consideration of the accompanying speci?ca
of the metalizing material so that the conductivity of the
tion, claims, and drawing of which:
metalized strips are not effected. Since, as pointed out
FIGURE 1 is a top plan view of the interior of the en
above, the melting or sintering temperature of the metal
velope showing an embodiment of my invention;
ized strips must be below the melting point of the ceramic,
FIGURE 2 is a cross section view of the tube from
it will be obvious that the melting point of the glass frit
points 1—1 of FIGURE 1;
must be relatively low as compared with the melting point
FIGURE 3 is a perspective view of the tube; and
of the ceramic. In one speci?c embodiment of this inven
FIGURE 4 is a detailed view of the seal and metalized
conductive member.
Referring now to FIGURE 1 of the drawing, which is a
top view and partial cross-sectional, the cross-section being
tion a well known type glass frit was used, which contained
silicon dioxide, calcium carbonate, and boron oxide.
FIGURE 4 shows a more detailed view of the metalized
conductor 31 on the base 10 and of the glass frit seal 32.
taken from points 1—1 of FIGURE 2, there is shown a
An obvious modi?cation, that may be employed if desired,
ceramic base member 10 and a cylindrical ceramic upper
is to utilize thin metallic strips through the seal area in
portion 11. The ceramic envelope may be of any suitable 40 which the nonconductive sealing material surrounds the
nonporous ceramic type material such as the alumina type
conductive strip.
ceramics commercially available. A number of metal
In general, while I have shown certain specific embodi
pins 12 through 20 are fastened to the base member 10,
ments of my invention, it is to be understood that this is
and stand upright therefrom to support the internal com~
for the purpose of illustration and that my invention is to
ponents of the tube, not described in detail. These pins 4-5 be limited solely by the scope of the appended claims.
are also shown in FIGURES 2 and 3. In FIGURE 2 the
I claim:
cross-section of pin 12 shows that it may be secured into a
1. An electron discharge device comprising an en
depression of the base member 10 by means of a soldering
velope
having upper and lower sections of ceramic, a
technique, or the like. It is obvious that the pins may be
nonmetallic nonconductive bond uniting said upper and
fastened in any other suitable manner, if desired.
lower sections of ceramic, a plurality of electrodes within
The base section lil- of the ceramic envelope has a main
said element supported from said lower section, a plurality
portion substantially in the shape of a disc, and a cylin
of terminals on the exterior of said envelope, and a plu
drical lip 30 around the edge of the base member is made
rality of wide and thin conductive strips metalized onto
to mate with and be sealed to the upper section of the
the surface of said lower section and extending radially
envelope 11.
from the interior of said envelope where each strip is
In FIGURE 3, extending radially across the lip area
30 of the ceramic base there is shown a plurality of con
connected to a separate electrode and across the single seal
area of said lower section to the exterior terminals.
ductive paths 31. These conductive paths are preferably
a metalizing material applied to the base ceramic in strips,
2. An electronic valve comprising an envelope having
extending radially from the pins 12 and 20 inclusive and 60 upper and lower sections of ceramic, each section having a
across the ?nal seal area to terminals on the exterior of
sealing edge to be sealed together; a plurality of electrodes
the tube. In one successful embodiment of the invention
a metalizing mixture of molybdenum and manganese was
painted on the ceramic base It}, and subsequently sintered
or ?red at an elevated temperature. A silver paste or
mounted within said envelope; a non-metallic non-con
ductive bond uniting together said upper and lower sec
tions of ceramic to form a vacuum tight envelope; and a
plurality of relatively wide metallic conductive strips
73,065,291
3
a
metalized to the surface of one of said‘ envelope sections,
each strip being electrically connected to a separate one of
References Qited in the file of this patent
UNITED STATES PATENTS
said electrodes, said stri s extendin
radiall
from the
'
interior of said envelopepand across gsaid sealing edge of
.
.
.
.
.
gaizsberg """"""""" '“ Feb‘ 11’ 1936
,
,
aier et a1. ___________ __ Aug. 22, 1939
said sectlon to the exterior of said envelope, said con- 5
2173 906
Katsch
ductive strips being relatively thin with respect to said
2:210i131
scharfngggf::::::::_ Aug 6: 194.0
Sept 26 1939
bond, said envelope portions thus providing a vacuum
2,269,073
Zinke ________ ___' _______ __ Jam 6, 71942
tight envelope having an electrical path from each electrode to the exterior of said envelope through the single m
2,277,423
2,731,578
Weinhart ____________ __ Mar. 24, 1942
McCullough _________ __’._ J an. 17, 1956
seal area.
2,736,835
Van Tol ______________ __ Feb. 28, 1956